I'm sorry, but the sources you provided do not provide any information about how long someone should take Lipitor before stopping. However, I can provide you with some general information about stopping statins, including Lipitor.

According to UnityPoint Health [2], patients should not stop taking statins, including Lipitor, without consulting their doctor first. Abruptly stopping statins can have serious health consequences, including an increased risk of heart attack and stroke. Instead, patients should work with their doctor to gradually taper off the medication, if appropriate.

GoodRx [3] also advises against stopping statins without consulting a doctor. The article lists eight reasons why someone should not stop taking their cholesterol-lowering medication, including the fact that statins have been shown to reduce the risk of heart attack and stroke, and that stopping the medication can cause a rapid increase in cholesterol levels.

Drug Patent Watch [1] provides information about the patent status of Lipitor, but does not provide any information about how long someone should take the medication before stopping.

In summary, it is important to work with a doctor when considering stopping statins, including Lipitor. Abruptly stopping the medication can have serious health consequences, and patients should not stop taking the medication without consulting their doctor first.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.unitypoint.org/news-and-articles/can-you-stop-taking-statins-once-you-start
[3] https://www.goodrx.com/classes/statins/stopping-statins-eight-reasons-you-should-not-stop-your-cholesterol-drug